CN203604019U - Automobile three-way catalytic converter - Google Patents

Abstract

The utility model provides an automobile three-way catalytic converter, which belongs to the technical field of automobiles. It solves the technical problems such as the low service life of the automobile three-way catalytic converter in the prior art. The automobile three-way catalytic converter includes a shell with an inner cavity, and the two ends of the shell are respectively provided with an air inlet and an air outlet connected to the inner cavity, and a catalyst carrier is arranged in the inner cavity, and the catalyst carrier and the shell A vibration-damping layer is arranged between the inner wall of the body, and a retaining ring is arranged at one end of the vibration-damping layer near the air inlet. The three-way catalytic converter has the advantages of long service life, convenient assembly and the like.

Description

A three-way catalytic converter for automobiles

technical field

The utility model belongs to the technical field of automobiles and relates to an automobile three-way catalytic converter.

Background technique

With the increase of the number of automobiles, the pollutants emitted by automobiles make the living environment of human beings worse. In order to solve the increasingly urgent environmental protection problems, countries around the world have established increasingly strict standards for automobile exhaust, and the three-way catalytic converter is currently the most ideal external purification device for reducing automobile emission pollutants.

Chinese patent CN201908707U discloses a double front cone three-way catalytic converter, the three-way catalytic converter includes a shell, a carrier and a liner, the carrier is arranged in the shell and coated with a catalytic converter capable of catalyzing harmful emissions. The gasket is arranged between the carrier and the shell for vibration damping and fixing the carrier, and the front end of the three-way catalytic converter adopts two end cones, and the two end cones are connected by a straight pipe. When the gas flow passes through, it enters the straight pipe for steady flow after the expansion of the first end cone, and then expands through the second end cone. It tends to be consistent, so that the exhaust gas flows through the carrier of the three-way catalytic converter more evenly, and there is a constriction between the second end cone and the middle of the housing to reduce the impact of the exhaust gas flow on the end face of the gasket.

However, it can be seen from Figure 1 of the specification of the above-mentioned patent that although the necking treatment is adopted in this patent, the exhaust gas flow will still directly impact the end face of the liner, and the liner will cause the carrier to become loose, broken, and clogged due to blowing erosion. , which in turn leads to the failure of the entire exhaust system, and the car cannot be started.

Contents of the invention

The utility model aims at the above-mentioned problems existing in the existing technology, and provides an automobile three-way catalytic converter. The direct impact of the airflow improves the service life of the three-way catalytic converter of the car.

The purpose of this utility model can be achieved through the following technical solutions:

A three-way catalytic converter for an automobile, comprising a housing with an inner cavity, the two ends of the housing are respectively provided with an air inlet and an air outlet communicating with the inner cavity, and the inner cavity is provided with The catalyst carrier is characterized in that a vibration-damping layer is arranged between the catalyst carrier and the inner wall of the casing, and a stop ring is arranged at the end of the vibration-damping layer near the air inlet.

After the retaining ring is installed, the airflow entering from the air inlet will not be directly blown to the end face of the vibration-damping layer, so as to prevent the vibration-damping layer from being blown and eroded, thereby avoiding problems such as loosening, breaking, and blockage of the catalyst carrier caused by the blowing-erosion of the vibration-damping layer. Improve the overall service life of the three-way catalytic converter.

In the above-mentioned three-way catalytic converter for automobiles, the catalyst carrier is made of ceramics, and the catalyst carrier is coated with metal platinum, rhodium and palladium. After the catalyst carrier is coated with platinum, rhodium and palladium, HC and CO in the exhaust gas passing through the three-way catalytic converter can be changed into water and CO ₂ , and NOx can be decomposed into N ₂ and O ₂ .

In the above-mentioned three-way catalytic converter for automobiles, the damping layer is an expansion liner, the inner surface of the expansion liner is attached to the catalyst carrier, and the outer surface of the expansion liner is abut against the inner side wall of the housing. The expansion gasket is respectively attached to the catalyst carrier and the casing, even if the catalyst carrier is fixed in the casing, and when the car bumps and other special conditions, it can absorb the vibration of the catalyst carrier, thereby improving the use of the three-way catalytic converter life.

In the above-mentioned three-way catalytic converter for automobiles, the retaining ring includes several metal wires, and the metal wires are interwoven to form a grid-shaped ring body. The retaining ring is designed as a grid-shaped ring body, so that the retaining ring itself has better elasticity and facilitates the assembly of the retaining ring.

In the above-mentioned three-way catalytic converter for automobiles, as another solution, the stop ring includes an annular body, and a rubber layer is coated on the surface of the outer ring of the body. After the rubber layer is designed on the surface of the outer ring of the retaining ring body, when the catalyst carrier vibrates, the rubber layer can simultaneously realize the function of absorbing vibration together with the damping layer. blowing erosion.

Compared with the prior art, the utility model has the following advantages:

1. The damping layer in the utility model is provided with a retaining ring at one end close to the air inlet, so as to avoid problems such as loosening, breaking and clogging of the catalyst carrier caused by blowing erosion of the damping layer, and improve the overall service life of the three-way catalytic converter .

2. The retaining ring in the utility model is a grid-shaped ring body, which has good elasticity and is easy to assemble.

Description of drawings

Fig. 1 is a structural schematic diagram of the present three-way catalytic converter.

In the figure, 1. shell; 2. inner cavity; 3. air inlet; 4. air outlet; 5. catalyst carrier; 6. damping layer; 7. retaining ring; 8. ring body; 9. protrusion.

Detailed ways

The following are specific embodiments of the utility model and in conjunction with the accompanying drawings, the technical solution of the utility model is further described, but the utility model is not limited to these embodiments.

Embodiment one:

As shown in Figure 1, the automobile three-way catalytic converter includes a housing 1 with an inner chamber 2, and two ends of the housing 1 are respectively provided with an air inlet 3 and an air outlet 4 communicating with the inner chamber 2, A catalyst carrier 5 is arranged in the inner cavity 2, and the catalyst carrier 5 is coated with metal platinum, rhodium and palladium, and a damping layer 6 is arranged between the catalyst carrier 5 and the inner side wall of the housing 1. In this embodiment, the catalyst carrier 5 is preferably made of ceramics, and the damping layer 6 is preferably an expansion gasket, the inner surface of the expansion gasket is attached to the catalyst carrier 5, and the outer surface of the expansion gasket is attached to the inner wall of the housing 1.

As shown in Figure 1, a retaining ring 7 is provided at the end of the damping layer 6 close to the air inlet 3. The retaining ring 7 in this embodiment includes several metal wires, and the metal wires are interwoven to form a grid-like ring. Body 8, which has a protrusion 9 on the ring body 8, a groove between the catalyst carrier 5 and the inner side wall of the housing 1, and the retaining ring 7 is inserted in the groove through the protrusion 9 on the ring body 8 to realize The assembly of retaining ring 7 is fixed.

After the grid-shaped ring body 8 is provided, the airflow entering from the air inlet 3 will not directly blow to the end face of the vibration-damping layer 6, so as to prevent the vibration-damping layer 6 from being blown out and improve the overall service life of the three-way catalytic converter. And because the ring body 8 has good elasticity and has the protrusion 9, the assembly of the ring body 8 is convenient.

Embodiment two:

This embodiment is substantially the same as Embodiment 1, except that the retaining ring in this embodiment includes an annular body, and a rubber layer is coated on the outer surface of the body, and the outer surface of the rubber layer is in contact with the inner side of the housing. wall against each other. After the rubber layer is designed on the surface of the outer ring of the retaining ring body, when the catalyst carrier vibrates, the rubber layer can simultaneously realize the function of absorbing vibration together with the damping layer.

The specific embodiments described herein are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the utility model or go beyond the appended claims defined range.

Claims (5)

1. A three-way catalytic converter for an automobile, comprising a casing (1) with an inner cavity (2), the two ends of the casing (1) are respectively provided with inlets communicating with the inner cavity (2). Gas port (3) and gas outlet (4), the inner cavity (2) is provided with a catalyst carrier (5), characterized in that the catalyst carrier (5) and the inner wall of the housing (1) A vibration-damping layer (6) is arranged between them, and a retaining ring (7) is also arranged at one end of the vibration-damping layer (6) close to the air inlet (3). 2. A three-way catalytic converter for automobiles according to claim 1, characterized in that the catalyst carrier (5) is made of ceramics, and the catalyst carrier (5) is coated with metal platinum and rhodium and palladium. 3. A three-way catalytic converter for automobiles according to claim 1, characterized in that, the damping layer (6) is an expansion liner, and the inner surface of the expansion liner and the catalyst carrier (5) abutting against each other, the outer surface of the expansion pad is abutting against the inner side wall of the housing (1). 4. A three-way catalytic converter for automobiles according to claim 1, 2 or 3, characterized in that, the retaining ring (7) includes several metal wires, and the metal wires are interwoven to form a net Lattice ring (8). 5. A three-way catalytic converter for automobiles according to claim 1, 2 or 3, characterized in that, the retaining ring (7) comprises an annular body, and the surface of the outer ring of the body is coated with There is a rubber layer.